圆钢管再生混合混凝土框架性能的控制分析
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摘要
为了从结构层面分析柱截面含钢率和废弃混凝土取代率对再生混合混凝土组合结构抗震性能的控制作用,通过对四榀圆钢管再生混合混凝土框架进行定常轴力和水平往复荷载作用下的拟静力试验,研究各柱截面含钢率和柱内废弃混凝土取代率对试件的滞回特性、骨架曲线、延性、刚度退化和耗能能力等抗震性能指标的控制效果。结果表明,四榀框架破坏现象均为梁铰破坏机制;随着柱截面含钢率的提高,试件的水平承载力、塑性变形能力和位移延性显著提高,刚度退化速率降低;而废弃混凝土取代率对试件各项指标的影响规律与含钢率恰好相反,且影响程度有限;柱截面含钢率与废弃混凝土取代率共同作用,使二者对结构水平承载力和结构耗能能力有所不同。
In order to analyze the control effects of replacement rate of the demolished concrete and steel rate on seismic behavior of demolished concrete composite structures from the structure level,pseudo-static test of frames,which comprise four circular steel tubular columns filled with recycled mixed concrete,subjected to axial load and cyclical horizontal load was conducted.The effects of these two parameters on the seismic behavior indexes including hysteretic performance,skeleton curve,ductility,stiffness degeneration and dissipation were studied.The results show that all the failure modes of four circular steel tubular frames were the breaks of the beam hinge.With the steel column section rate increasing from 3.8%to 7.7%,the horizontal bearing capacity,the plastic deformation capacity and the ductility coefficient of the specimens rise significantly,and the degeneration rate of stiffness reduces.However,the influence rule of the recycled concrete rate on the targets is contrary to that of steel rate and the influence degree is limited.The synergetic action of the demolished concrete rate and the steel rate leads to various horizontal bearing capacities and energy-dissipating capacities of the structures.
In order to analyze the control effects of replacement rate of the demolished concrete and steel rate on seismic behavior of demolished concrete composite structures from the structure level,pseudo-static test of frames,which comprise four circular steel tubular columns filled with recycled mixed concrete,subjected to axial load and cyclical horizontal load was conducted.The effects of these two parameters on the seismic behavior indexes including hysteretic performance,skeleton curve,ductility,stiffness degeneration and dissipation were studied.The results show that all the failure modes of four circular steel tubular frames were the breaks of the beam hinge.With the steel column section rate increasing from 3.8%to 7.7%,the horizontal bearing capacity,the plastic deformation capacity and the ductility coefficient of the specimens rise significantly,and the degeneration rate of stiffness reduces.However,the influence rule of the recycled concrete rate on the targets is contrary to that of steel rate and the influence degree is limited.The synergetic action of the demolished concrete rate and the steel rate leads to various horizontal bearing capacities and energy-dissipating capacities of the structures.
引文
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[2]陈宗平,张向冈,薛建阳,等.钢管再生混凝土柱-钢筋再生混凝土梁框架抗震性能试验研究[J].土木工程学报,2014,35(10):22-31.Chen Z P,Zhang X G,Xue J Y,et al.Experimental study on seismic performance of recycled aggregate concrete filled steel tube column and reinforced recycled aggregate concrete beam frame[J].China Civil Engineering Journal,2014,35(10):22-31.(in Chinese)
[3]叶世昌.再生骨料混凝土拉伸徐变影响因素试验研究[D].福州:福州大学,2014.Ye Sh Ch.Experimental research on influencing factors of tensile creep of recycle aggregate concrete abstract[D].Fuzhou:Fuzhou University,2014.(in Chinese)
[4]李兵,孟爽,杨永生.不同参数变化对方钢管再生混凝土柱抗震性能的影响[J].沈阳建筑大学学报(自然科学版),2015(6):1 066-1 074.Li B,Meng Sh,Yang Y Sh.Effects of different parameters on seismic performance of recycled concrete filled square steel tubular colunns[J].Journal of Shenyang Jianzhu University(Natural Science),2015(6):1066-1 074.(in Chinese)
[5]张向冈.钢管再生混凝土构件及其框架的抗震性能研究[D].南宁:广西大学,2014.Zhang X G.Study on seismic behavior of recycled aggregate concrete filled steel tube component and frame abstract[D].Nanning:Guangxi University,2014.(in Chinese)
[6]李兵,王维浩,孟爽.钢管再生混凝土受弯构件有限元分析[J].沈阳建筑大学学报(自然科学版),2014(4):644-650.Li B,Wang W H,Meng Sh.Finite element analysis for bending of recycled concrete filled steel tube[J].Journal of Shenyang Jianzhu University(Natural Science),2014(4):644-650.(in Chinese)
[7]吴波,刘琼祥,刘伟.钢管再生混合构件初探[J].工程抗震与加固改造,2008,30(4):123-127.Wu B,Liu Q X,Liu W.Primary study on recycledconcrete-segment filled steel tubular members[J].Earthquake Resistant Engineering and Retrofitting,2008,30(4):123-127.(in Chinese)
[8]吴波,刘伟,刘琼祥,等.薄壁钢管再生混合短柱轴压性能试验研究[J].建筑结构学报,2010,31(8):22-28.Wu B,Liu W,Liu Q X,et al.Axial behavior of thinwalled steel stub columns filled with demolished concrete segment lump[J].Journal of Building Structures,2010,31(8):22-28.(in Chinese)
[9]吴波,张金锁,赵新宇.薄壁方钢管再生混合短柱轴压性能试验研究[J].建筑结构学报,2012,33(9):30-37.Wu B,Zhang J S,Zhao X Y.Tests on seismic behavior of square thin-walled steel tubular columns filled with demolished concrete blocks[J].Journal of Building Structures,2012,33(9):30-37.(in Chinese)
[10]吴波,许喆,刘琼祥,等.薄壁钢管再生混合柱的抗剪性能试验[J].土木工程学报,2010,43(9):12-21.Wu B,Xu Zh,Liu Q X,et al.Test of the shear behavior of thin-wall steel tubula rcolumns filled with demolished concrete segments lumps[J].China Civil Engineering Journal,2010,43(9):12-21.(in Chinese)
[11]Varma A H,Ricles J M,Sause R,et al.Seismic behavior and modeling of high-strength composite concrete-filled steel tube(CFT)beam-columns[J].Jornal of Constructional Steel Research,2002,58(5):725-758.
[12]赵新宇.薄壁圆钢管再生混合柱及其节点的试验研究与分析[D].广州:华南理工大学,2012.Zhao X Y.Experimental and analytical studies on thinwalled circular steel tubular columns filled with DCBs&FC and novel joints connecting RC beams to such columns[D].Guangzhou:South China University of Technology,2012.(in Chinese)
[13]金属材料室温拉伸试验方法:GB/T 228-2002[S].北京:中国标准出版社,2002.Metallic material-tensile testing at ambient temperature:GB/T 228-2002[S].Beijing:Standards Press of China,2002.
[14]普通混凝土力学性能试验方法标准:GB/T 50081-2002[S].北京:中国建筑工业出版社,2002.Standard for test method of mechanical properties on ordinary concrete:GB/T 50081-2002[S].Beijing:China Architecture&Building Press,2002.